I'm learning some of the basics of audio, for my own job and for personal projects.
Most of the 'commercial' software I've used isn't as clear and readable in what it makes and how it behaves as your free tool. The generators are great, the visual feedback on what you're doing is great, the mutate button is just so great...
I can only compare how delightful it is to use to the sound module in Dreams (the Playstation creation game).